Which command would you run to view interface information related to cluster health?

To view interface information related to cluster health, using the command cphaprob -a if is appropriate because it provides a comprehensive overview of all interfaces in the cluster, including their status, state, and health metrics. This command is specifically designed to display detailed information about the cluster interfaces, making it easy to assess whether they are functioning correctly and are part of the active cluster setup. The output from this command helps in troubleshooting issues related to the cluster’s network interfaces.

In contrast, the other commands, while related to cluster health, do not focus specifically on the detailed interface information. For example, cphaprob -i if might not provide the same level of detail as the -a option, and cphaprob state typically gives a higher-level overview of the cluster's state without the granularity related to individual interfaces. cphaprob -p if is used for a different purpose, primarily related to physical interface settings rather than the health of the cluster. Thus, the use of cphaprob -a if is the most suitable for the intended purpose of viewing cluster interface health.